当我尝试从SQL Server访问数据时，数据列的类型为varchar。但我尝试将其设置为文本框，我得到了这种类型的异常
将varchar值'09ran01'转换为数据类型int
时转换失败package src.ui;
import src.ui.ImageHandler;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.event.*;
import java.sql.*;
import javax.swing.*;
import java.awt.*;
import java.util.Calendar;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.text.DateFormat;
import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.swing.JOptionPane;
public class AddAccount extends JPanel implements ActionListener, DocumentListener, KeyListener {
String imagefolder = ImageHandler.returnimagepath();
Image bgImage = Toolkit.getDefaultToolkit().createImage(getClass().getResource("/src/ui/images/bgc.jpg"));
private static final long serialVersionUID = 1L;
public static final String DATE_FORMAT_NOW = "yyyy-MM-dd HH:mm:ss";
String iden[] = {"Student","Others"};
String type[] = {"Account User", "Walkthrough User"};
JLabel userid = new JLabel("USER ID");
JLabel name = new JLabel("FULL NAME");
JLabel pswrd = new JLabel("PASSWORD");
JLabel ident = new JLabel("IDENTIFICATION");
JLabel idno = new JLabel("ID NUMBER");
JLabel Add = new JLabel("ADDRESS");
JLabel acctype = new JLabel("ACCOUNT TYPE");
JTextField userFld = new JTextField(10);
JTextField nameFld = new JTextField(10);
JPasswordField pswrdFld = new JPasswordField(10);
JComboBox identC = new JComboBox(iden);
JComboBox actype = new JComboBox(type);
JTextField idFld = new JTextField(10);
JTextArea addArea = new JTextArea(10, 10);
JButton okButton = new JButton("OK");
JButton exitButton = new JButton("RESET");
JButton b1 = new JButton("SEARCH");
JScrollPane scroll = new JScrollPane(addArea);
public static Connection getConnection() {
Connection conn = null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://127.0.0.1/cybman", "root", "");
} catch (Exception e) {
//System.out.println(e);
}
return conn;
}
public static Connection getConnection1() {
Connection con = null;
try {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
con = DriverManager.getConnection("jdbc:sqlserver://localhost\\BCA1:1433;databaseName=Old_Bhandarkars;user=sa;password=1234");
} catch (Exception e) {
JOptionPane.showMessageDialog(null,"SERVER ERROR");
//System.out.println(e);
}
return con;
}
public void changedUpdate(DocumentEvent ev) {
}
public void removeUpdate(DocumentEvent ev) {
}
public void insertUpdate(DocumentEvent ev) {
}
public void paintComponent(Graphics g) {
g.drawImage(bgImage, 0, 0, this);
}
public void init() {
setLayout(null);
okButton.addActionListener(this);
b1.addActionListener(this);
exitButton.addActionListener(this);
pswrdFld.addActionListener(this);
pswrdFld.setEchoChar('*');
addArea.getDocument().addDocumentListener(this);
identC.addActionListener(this);
actype.addActionListener(this);
userid.setBounds(270, 20, 120, 20);
userFld.setBounds(470, 20, 140, 20);
b1.setBounds(670, 20, 100, 20);
name.setBounds(270, 70, 120, 20);
nameFld.setBounds(470, 70, 140, 20);
pswrd.setBounds(270, 120, 120, 20);
pswrdFld.setBounds(470, 120, 140, 20);
ident.setBounds(270, 170, 120, 20);
identC.setBounds(470, 170, 140, 20);
idno.setBounds(270, 220, 120, 20);
idFld.setBounds(470, 220, 140, 20);
acctype.setBounds(270, 270, 120, 20);
actype.setBounds(470, 270, 140, 20);
Add.setBounds(270, 320, 320, 20);
scroll.setBounds(470, 320, 140, 60);
okButton.setBounds(270, 410, 100, 20);
okButton.addKeyListener(this);
exitButton.setBounds(510, 410, 100, 20);
}
public AddAccount() {
init();
add(userid);
add(userFld);
add(name);
add(nameFld);
add(pswrd);
add(pswrdFld);
add(ident);
add(identC);
add(idno);
add(idFld);
add(acctype);
add(actype);
add(Add);
add(b1);
add(scroll);
add(okButton);
add(exitButton);
}
public static String now() {
Calendar cal = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat(DATE_FORMAT_NOW);
return sdf.format(cal.getTime());
}
private String getDateTime() {
DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
Date date = new Date();
return dateFormat.format(date);
}
public class Function
{
Connection con=getConnection1();
ResultSet rs;
public ResultSet find(String s)
{
int a=Integer.parseInt(s);
try{
Statement sta = con.createStatement();
String s1 = "select * from Members where Fld_Member_Id="+a+"";
rs = sta.executeQuery(s1);
}
catch(Exception ex){
JOptionPane.showMessageDialog(null,"No connection");
//JOptionPane.showMessageDialog(null,ex.getMessage());
}
//JOptionPane.showMessageDialog(null,rs);
return rs;
}
}
public void actionPerformed(ActionEvent e) {
String str = e.getActionCommand();
char[] pass;
String uid;
String nam;
String add;
String id;
String idnum;
String actyp;
int amt = 0;
String datE;
if (str.equals("SEARCH")) {
Function f=new Function();
ResultSet rs=null;
String n1="Fld_First_Name";
String i1="Fld_Member_Id";
String address="Fld_PAddr";
uid = userFld.getText();
if(uid.equals(""))
{
JFrame msg=new JFrame();
JOptionPane.showMessageDialog(msg, "Please enter the user id", "Error Message", JOptionPane.ERROR_MESSAGE);
}
// simple.main();
else
{
//idFld.setText(userFld.getText());
rs=f.find(userFld.getText());
// System.out.println("Fld_First_Name");
try{
if(rs.next()){
// int i = Integer.parseInt(rs.getString("Fld_First_Name"));
// int j = Integer.parseInt(rs.getString("Fld_Member_Id"));
// int k = Integer.parseInt(rs.getString("Fld_PAddr"));
nameFld.setText(rs.getString("Fld_First_Name"));
idFld.setText(rs.getString("Fld_Member_Id"));
addArea.setText(rs.getString("Fld_PAddr"));
}
else
{
JOptionPane.showMessageDialog(null,"No data");
}
}
catch(Exception ex)
{
JOptionPane.showMessageDialog(null,ex.getMessage());
}
}
}
if (str.equals("OK")) {
try {
uid = userFld.getText();
nam = nameFld.getText();
pass = pswrdFld.getPassword();
add = addArea.getText();
idnum = idFld.getText();
id = (String) identC.getSelectedItem();
actyp = (String) actype.getSelectedItem();
datE = getDateTime();
String pwrd = new String(pass);
Connection conn = getConnection();
/*ERROR CHECKING*/
boolean success = true;
if (uid.equals("")) {
JFrame msg = new JFrame();
JOptionPane.showMessageDialog(msg, "Please enter the user id", "Error Message", JOptionPane.ERROR_MESSAGE);
success = false;
} else if (nam.equals("")) {
JFrame msg = new JFrame();
JOptionPane.showMessageDialog(msg, "Please enter the name", "Error Message", JOptionPane.ERROR_MESSAGE);
success = false;
} else if (pwrd.equals("")) {
JFrame msg = new JFrame();
JOptionPane.showMessageDialog(msg, "Please enter the password", "Error Message", JOptionPane.ERROR_MESSAGE);
success = false;
} else if ((!id.equals("Student")) && (idnum.equals(""))) {
JFrame msg = new JFrame();
JOptionPane.showMessageDialog(msg, "Please enter the identification number", "Error Message", JOptionPane.ERROR_MESSAGE);
success = false;
} else if (add.equals("")) {
JFrame msg = new JFrame();
JOptionPane.showMessageDialog(msg, "Please enter the address", "Error Message", JOptionPane.ERROR_MESSAGE);
success = false;
}
/*end of ERROR CHECKING*/
if (success == true) {
///////////ENSURE/////////
JFrame msg = new JFrame();
int choice;
choice = JOptionPane.showConfirmDialog(msg, "Are you sure?", "Select your choice", JOptionPane.OK_CANCEL_OPTION);
/////////////////////////
if (choice == JOptionPane.OK_OPTION) {
str = "insert into account(userid,name,password,address,identification,identificationnum,amount,dates,acctype" + ") values (?,?,?,?,?,?,?,?,?)";
PreparedStatement ps = conn.prepareStatement(str);
ps.setString(1, uid);
ps.setString(2, nam);
ps.setString(3, pwrd);
ps.setString(4, add);
ps.setString(5, id);
ps.setString(6, idnum);
ps.setInt(7, amt);
ps.setString(8, datE);
ps.setString(9, actyp);
int count;
count = ps.executeUpdate();
count++;
count--;
//////////////////////////////
ReportPanel.userC.addItem(uid);
ViewAccount.userC.addItem(uid);
if (actyp.equals("Account User")) {
RechargePanel.userC.addItem(uid);
}
//////////////////////////////
JFrame msg1 = new JFrame();
JOptionPane.showMessageDialog(msg1, "An account has been successfully created", "Information", JOptionPane.INFORMATION_MESSAGE);
} else if (choice == JOptionPane.CANCEL_OPTION) {
JOptionPane.showMessageDialog(msg, "Account Creation Aborted", "Information", JOptionPane.INFORMATION_MESSAGE);
}
}
//conn.close();
} catch (SQLException e1) {
String error;
JFrame msg = new JFrame();
//error=e1.toString();
error = "Your entry for user id already exists";
JOptionPane.showMessageDialog(msg, error, "Error Message", JOptionPane.ERROR_MESSAGE);
} catch (Exception e1) {
// TODO Auto-generated catch block
String error;
JFrame msg = new JFrame();
error = e1.toString();
JOptionPane.showMessageDialog(msg, error, "Error Message", JOptionPane.ERROR_MESSAGE);
}
}
///////////////////////////////////////////////////////////////////////////
if (str.equals("RESET")) {
try {
userFld.setText("");
nameFld.setText("");
pswrdFld.setText("");
addArea.setText("");
idFld.setText("");
} catch (Exception e2) {
String error;
JFrame msg = new JFrame();
error = e2.toString();
JOptionPane.showMessageDialog(msg, error, "Error Message", JOptionPane.ERROR_MESSAGE);
}
}
}
///////////////////////////////////////////////////////////
public void keyPressed(KeyEvent key) {
//
}
/////////////////////////////////////////////////////
public void keyReleased(KeyEvent key) {
if (key.getSource() == pswrdFld) {
if (key.getKeyCode() == KeyEvent.VK_ENTER) {
}
}
}
/////////////////////////////////////////////////
public void keyTyped(KeyEvent key) {
//
}
//////////////////////////////////////////////
}
如何将所有值设置为文本框？
field name data type
---------------------------------------------------------------------
Fld_First_Name varchar
Fld_Member_Id varchar
Fld_PAddr nvarchar
SELECT * FROM Members where Fld_Member_Id='14932';
_____________________________________________________________________________
Fld_Member_Id Fld_First_Name Fld_PAddr
______________________________________________________________________________
14932 abc abc
答案 0 :(得分：4)
如果您不确定memberID的类型是什么，请使用
idFld.setText(String.valueOf("Your value"));
答案 1 :(得分：3)
在SQL查询的WHERE子句中，varchar变量应该在单引号内。试试String s1 = "select * from Members where Fld_Member_Id='"+a+"'";
将单引号添加到语句中。我认为如果正确传递varchar值，它应该使用您提到的setText方法。